Insulator



" y 9, 1929- G. SCHOENTHALER 1,719,945

INSULA'TOR Filed April 14, 191,9 2 Sheets-Sheet l I I I.

Witwmo Patented July 9, 1929.

UNITED STATES oFFicE.

ORGE HENRY SCHOENTHALER, OF ROCHESTER, NEW YORK, ASSIGNOR, BY MESNEASSIGNMENTS, TO LOCKE INSULATOR CORPORATION, OF BALTIMORE, MARYLAND,

A CORPORATION OF MARYLAND.

INSULATOB.

Application filed April 14, 1919. Serial N0. 289,793.

The invention broadly considered relates to insulators and moreparticularl 'to' insulators of the suspension type, in w llCll' oneinsulator unit is suspended from a rigid support or a similar insulatorunit.

The main object of my invention, generally stated, is to provide novelmeans for connecting an insulator to the metallic elements whichtogether with the insulator form what may be termed an insulator unit.

, There are other objects of my invention as will more fully appear fromthe detailed description thereof when taken in connection with theaccompanying drawings, wherein I have illustrated certain embodiments ofthe invention and in which:

Figure 1 is a vertical cross section through an insulator unit, showingthe invention applied thereto;

Figure 2 is a side elevation of the skeleton p;

Figure 3 is a top plan view of the cap illustrated in Figure 2;

Figure 4 is a section taken on line 4-4 of Figure 1;

Figure 5 is a section taken on line 55 of Figure 1.

Throughout the specifications and drawings, like parts are designated bylike reference characters.

Referring to the drawings, which it will be understood are merelyillustrative of the underlying features of the invention, the numeral 1designates an insulator of the suspension type, 2 the neck or stem and 3the flaring skirt which curves outwardly and downwardly from the neck orstem 2. Adjacent the juncture of the said neck and skirt portions of theinsulator, there is preferably provided in the said neck 2 an undercutgroove or recess 4.

Surrounding the projecting neck 2 of said insulator there is provided abell-shaped cap 5 which may and preferably does comprise an upwardlyflaring ring 6 having an undercut circumferentially extending groove 6on the underor inner side thereof. The said cap is provided with meansfor suitably connecting the same to an insulator support or companioninsulator, the said means may, for exam 1e, comprise a plurality ofstraps 7 preferably four in number and a pair of pivot ears 8-8, whichmay, for convenience,

be formed integral with one of said straps 7. The said pivot ears 8'areeach provided with an aperture 9 for the reception of a bolt or likefastening means.

Within the said stem 2 and opening from the under side of the insulatoris a cylindrical recess 10, this recess is preferably widened out orincreased in diameter ad-v.

wardly extending lips or flanges 14 and may and preferably are providedon their interior faces with outwardly flaring wedge faces 14*, theobject and purpose of which will hereinafter be more fully described.

To securely and stron ly unite the cap and bolt to the insulator bo y, Iemploy a metal having a comparatively low melting point and possessingwhen cold both strength and resiliency. I prefer to use Babbitt metal,an alloy composed of copper, tin and antimony, as this metal possessesthe desirable qualities set forth above, but it is to be understood thatin the broad aspect of my invention I do not limit myself to this metalas other metal applied in a molten state may be employed advantageouslyas the connecting means between the parts of an insulator unit.

In carrying out my invention, I may pour the molten metal between theoppositely disposed grooves 4 and 6 in the insulator body and caprespectively so that the metal when cold will fill the said grooves, asclearly as a split ring 15, as shown inFig. 4.

The eyeibo'lt which is received within the recess in the insulator bodyis also preferably connected to the insulator by means of metalintroduced in a molten state. To

assemble the eye bolt 12 with the insulator body, the latter is invertedand an asbestos gasket 18 inserted within the said recess, a small wedgeblock 19 of cruciform out line is then placed in the bottom of therecess and the eye bolt inserted, the wedging faces 14 on the legs ofthe latter are adapted to engage the correspondingly formed wedgingfaces 011 the wedge 19 to separate the said legs so that the outwardlypro ecting lips 14 thereof extend within the chamber 11 of the recess10.

While the eye bolt 12. is maintained in this position, the molten metalis poured into the recess filling in the intervening spaces between thewalls of the recess and j the legs of the eye bolt, as clearly shown at20 in Fig. 5. e

The insulator body is preferably so constructed that the adjacentportions of the grooves 4 and 11 hereinbefore described we tendsubstantially in the same direction and are slightly spaced laterallyfrom the same vertical plane, in other words, the adjacent portions ofthe said annular grooves are so arranged that the strains borne by theinstilator body 'due to the pull of the cap and bolt in oppositedirections, are largely, if not entirely, compressive instead oftensional, thereby affording a'unit working at a smaller percentage ofits ultimate mechanical and electrical strength than those units nowcommonly employed. The metallic con nector is also placed undercompressive strains by employing the construction herein described andmoreover any slight expansion or contraction of the metallic connectorwill be taken care of by the ability'of the metal parts to rise or fallwith reference to the insulator body, the com ressibility' of 'theasbestos gasket hereinbe ore described permitting the necessary movementof the eye bolt. As will be noted from Figure 1, the eap is normallyslightly spaced from the exterior surface of the neck of the insulatorand this slight spacing, together with the inclined shoulders of thegroove 6 permit of the slight movement of the cap to compensate for theexpansion or contraction of the metallic connector.

The ability of the cap and eye bolt to move and thus compensate for theexpansion of the metallic connector eliminates all stresses caused bythe expansion of the parts and thereby avoids all damage to theinsulator body.

It will be understood that while my novel form of connecting means maybe advantageously employed in connection with the solid or imperforate.form of cap that I prefer to use the same in combination with theskeleton form of cap, as shown in Figs. 1 to 3 inclusive, since by thiscombinatipn I obtain a better balance of the electrostatic field than ispossible with the imper- 'into the irregularities and will follow thecontour of the insulator body and metal parts.

Having now described my invention, although it is to be understood thatthe terms employed are to be taken in their descriptive and not theirlimited sense, what I claim and desire to secure by Letters Patent is:

1. In an insulator, a dielectric body having an upstanding neck portionformed with a downwardly opening recess with an undercut portion, a pinlocated within the recess, the pin being of substantial U-shape andhaving legs split and spread, means within the recess for expanding thepin at the ends of the split portions thereof, and means for embeddingthe pin within the recess.

2. In an insulator, a dielectric body having a stem portion formed atits underside with a recess and an undercut groove within the recess, apin extending within the recess and including a pair of leg portionseach split in sections with the sections spaced apart, a wedge memberlocated within the recess and engaging against the sections of both legsof-the pin for expanding the pin into saidgroove, and means forembedding the pin within the recess.

In testimony whereof I aflix my signature.

GEORGE HENRY SCHOENTHALER.

